How Much Milk Should a 4-Week-Old Baby Drink?

How Much Milk Should a 4 Week Old Baby Drink Per Day?

The American Academy of Pediatrics (AAP) and the CDC describe a typical intake of about 150 ml of milk per kilogram of body weight per day in the early months. A 4-week-old usually weighs between 3.6 and 5.0 kg (7.9–11 lbs), so the daily target is about 540–750 ml (18–25 oz).

This is a starting estimate, not a quota. Babies vary day to day, and a healthy baby who takes a bit more or less while gaining weight steadily is usually doing fine. Wet diapers, alertness and growth at check-ups tell you more than any single bottle.

How Much Formula for a 4 Week Old: Worked Example

To calculate your own baby's amount, multiply their weight in kilograms by 150, then divide by the number of feeds they usually take in 24 hours. The formula calculator does this instantly in ml or oz.

How Many Ounces Should a 4 Week Old Eat? Lookup Table

Find your baby's approximate weight, then use the column that matches how many feeds they take each day.

Between two rows? Multiply the exact weight by 150 and divide by your feed count. You can also use the Baby Milk Calculator.

4 Week Old Feeding Schedule

Most formula-fed 4-week-olds feed 7–8 times in 24 hours, about every 3 to 4 hours. Breastfed babies often feed 8–12 times, sometimes in clusters during the evening. A sample day might look like this:

• Morning wake-up feed, then another about 3 hours later.
• Midday and early-afternoon feeds, roughly 3–4 hours apart.
• Closer-together feeds in the late afternoon and evening.
• One or two night feeds, depending on your baby.

Treat this as a pattern you may notice, not a timetable to enforce. Responsive feeding means watching for early hunger cues (rooting, hands to mouth, turning the head) instead of the clock. Crying is a late cue and makes feeding harder to start. Slowing their suck, relaxing their hands or turning away are signs they are full.

Why Does My 4-Week-Old Seem Hungrier Than Usual?

Babies often have a stretch of wanting more milk, more often, somewhere in the first month or two. They may drain bottles quickly, ask to feed again soon after, and be fussier in the evening. These phases usually last a few days.

• Feed a little earlier when you see early hunger cues.
• Offering an extra 10–15 ml in the bottle is reasonable if your baby is clearly still asking for more.
• Use paced bottle feeding so your baby can signal fullness.
• Return to the calculated range once things settle; the daily total is a baseline, not a ceiling.

See why a newborn seems hungry all the time for more. If hunger seems constant for more than several days, or weight gain is too slow or too fast, talk with your pediatrician.

Is My 4-Week-Old Getting Enough Milk?

• Wet diapers:at least 5–6 a day.
• Weight gain: steady gain along their growth curve at check-ups.
• Settling: relaxed and content for a while after most feeds.
• Alertness: awake and responsive between feeds.

Contact your pediatrician if diapers drop off, your baby is hard to wake for feeds, vomits repeatedly, or weight gain stalls. This guide is general information, not individual medical advice.

The Bottom Line

A 4-week-old typically takes about 540–750 ml (18–25 oz) of milk per day, or roughly 70–105 ml (2.5–3.5 oz) per feed across 7–8 feeds. Use the table as a starting point and let hunger and fullness cues, diapers and growth guide the fine-tuning. For the month ahead see the 1-month-old guide.